VHDL code to find square root of number?

Question

Is there is any in built function or any library that can be included in the design to find square root of a number?

Answer 1

This one worked for me.

library ieee; 
use ieee.std_logic_1164.all; 
use IEEE.STD_LOGIC_unsigned.ALL;

entity squart is port( 
clock      : in std_logic;  
data_in    : in std_logic_vector(7 downto 0); 
data_out   : out std_logic_vector(3 downto 0)); end squart;

architecture behaviour of squart is

signal part_done  : std_logic := '0';
signal part_count : integer := 3; 
signal result     : std_logic_vector(4 downto 0) := "00000"; 
signal partialq   : std_logic_vector(5 downto 0) := "000000";

begin   
    part_done_1: process(clock, data_in, part_done)  
    begin
        if(clock'event and clock='1')then
            if(part_done='0')then
                if(part_count>=0)then
                    partialq(1 downto 0)  <= data_in((part_count*2)+ 1 downto part_count*2);
                    part_done <= '1';    else
                    data_out <= result(3 downto 0);    
                end if;    
                part_count <= part_count - 1;
                elsif(part_done='1')then
                    if((result(3 downto 0) & "01") <= partialq)then
                        result   <= result(3 downto 0) & '1';
                        partialq(5 downto 2) <= partialq(3 downto 0) - (result(1 downto 0)&"01");    
                    else 
                        result   <= result(3 downto 0) & '0';
                        partialq(5 downto 2) <= partialq(3 downto 0);                     
                    end if;   
                    part_done  <= '0';
                end if;
            end if;  
        end process;   
    end behaviour;